The US Attorney’s Office said it had received no word from the FBI about seeking any possible charges, the Free Press reported.

And officials at the Wayne County Prosecutor’s Office said they were not involved in the case.

Former federal prosecutor Peter Henning said he doubted the daring duo would face any criminal charges. At most, he told the paper, they would be cited for lewd and lascivious behavior.

“It’s going to be very hard to find that this is criminal conduct under the federal code because it’s not a threat to the safety of the airline, or other passengers,” said Henning, a Wayne State University law professor.

“It’s certainly distasteful, but it was not disruptive or interfering with the operation of the plane — and that’s typically what (airline incident) charges involve … The embarrassment is probably the biggest punishment they can receive.”

Detroit Metro Airport spokewoman Erica Donerson said the FBI took over the case after the crew alerted police about the incident.

“The FBI issued the citations, so they are handling the case,” said Donerson, adding that she didn’t know the exact nature of the citation.

Detroit’s former FBI chief Andy Arena said he has never seen anything like this.

“It’s criminal stupidity, felony stupidity,” he told the Free Press.

Arena added that he had seen cases where airline passengers were criminally charged for misbehaving on a plane.

But those cases typically involved men who fondled children or inappropriately touched female passengers, he said.